At the beginning of each opponent's upkeep, they lose 1 life and you put a -1/-1 counter on up to one target creature they control. Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)
![Persistent Constrictor (Extended Art) [Duskmourn: House of Horror Commander]](http://tcg.hereticshaven.com.au/cdn/shop/files/1b874319-5d65-4875-be0a-00adcf0cc476.png?v=1775361118&width=1445)